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U.S. Rep. Marc Veasey, D-Fort Worth, said he often had a chance to talk to Sutherland when meeting with Angle in Washington.

"He was a very low-key guy, very quiet, but just a really good guy," Veasey said. "He was very nice, very respectful and he always worked really hard."

Sutherland believed in his work at the Lone Star Project, said Gosar, a legislative correspondent and aide for Veasey.

"He was a really kind, very gentle person, and he honestly believed in the Texas progressive cause," he said. "He wasn't from Texas, but he was ready and willing to help."

Most recently, Sutherland worked for New Blue Interactive, helping Democratic congressional members reach out to constituents.